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Direct Imaging of Stochastic Domain-Wall Motion Driven by Nanosecond Current Pulses

2007; American Physical Society; Volume: 98; Issue: 18 Linguagem: Inglês

10.1103/physrevlett.98.187202

1092-0145

Guido Meier, Markus Bolte, René Eiselt, Benjamin Krüger, Dong‐Hyun Kim, Peter Fischer,

Theoretical and Computational Physics

Magnetic transmission x-ray microscopy is used to directly visualize the influence of a spin-polarized current on domain walls in curved permalloy wires. Pulses of nanosecond duration and of high current density up to 1.0x10(12) A/m(2) are used to move and to deform the domain wall. The current pulse drives the wall either undisturbed, i.e., as composite particle through the wire, or causes structural changes of the magnetization. Repetitive pulse measurements reveal the stochastic nature of current-induced domain-wall motion.